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1. obsolete Something that is so strange, interesting, or unexpected that it causes one to stare with one's mouth open. A: "I think that seeing a horse in our kitchen certainly counts as gapeseed, don't you?" B: "Uh, indeed. Where is the stable boy?"
2. obsolete Someone who gapes or gawks at something. Show some respect—don't be a gapeseed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.